This study investigates whether people entrain their body sway in everyday face-to-face communication. Interpersonal entrainment has been observed under experimental conditions, but not in daily life. We used wearable sensors to measure individual body vibration and face-to-face interactions in daily life. The observation included at least 100 participants from each of seen organization over a period of two to three months. We carried out measurements over a period of two to three months for each organization. It was found that the body vibration frequencies of two participants become more closer in face-to-face situations than in non-face-to-face situations. This result suggests that interpersonal entrainment of body sway occurs in everyday face-to-face communication.